feat: introduce fullfill or fail based on server result for callkit

[santhoshvai]

💡 Overview

According to callkit spec we need to fulfill or fail based on server result for accept and endcall.

• This avoids other calls to interfere while joining or ending happens (which can technically but rarely happen)
• Fixes the issue of quick decline not working due to JS bridge not loading at all - link to the issue in callkeep

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Latest commit: 60fa2fb

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